KR-20260064143-A - Non-welded seismic reinforcement system with energy-absorbing ribs for seismic retrofitting of steel structure connections

KR20260064143AKR 20260064143 AKR20260064143 AKR 20260064143AKR-20260064143-A

Abstract

The present invention relates to a weldless seismic reinforcement system equipped with energy-absorbing ribs for seismic reinforcement of steel structure joints. It applies notched ribs designed to absorb most of the seismic energy to prevent damage to key members and improve seismic performance of existing end-plate type beam-column joints, while completely eliminating welding work during construction to remove quality degradation and the risk of fire caused by welding by unskilled workers. The present invention is characterized by comprising: an energy absorbing member installed between a beam and a column; a first metal fitting having a width wider than the upper flange of the beam and attached to the upper surface of the upper flange of the beam; a first connecting member formed in pairs on the left and right sides of the beam, with its upper end fastened to the first metal fitting and its lower end fastened to the first fastening flange of the energy absorbing member to fix the energy absorbing member to the beam; a second metal fitting having a width wider than the other flange of the beam and attached to the side of the other flange of the beam; and a second connecting member formed in pairs on the left and right sides of the column, with its one end fastened to the second fastening flange of the energy absorbing member and its other end fastened to the second metal fitting to fix the energy absorbing member to the column.

Inventors

오상훈
박수민

Assignees

부산대학교 산학협력단

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (14)

A column installed vertically having a first web and a first flange and a second flange formed respectively on one side and the other side centered on the first web; An end plate attached and fastened facing one flange of the above column, a second web formed elongated in one direction from the end plate, and a beam installed horizontally having an upper flange and a lower flange formed respectively at the upper and lower ends centered on the second web; An energy absorbing member comprising: a first fastening flange having a width wider than the lower flange of the beam and attached to the lower surface of the lower flange of the beam; a second fastening flange having a width wider than the one flange of the column and attached to the side of the one flange of the column; and a rib connecting the first fastening flange and the second fastening flange, which deforms and absorbs energy in the middle when an earthquake occurs; A first metal fitting having a width wider than the upper flange of the beam and attached to the upper surface of the upper flange of the beam; A first connecting member that forms a pair on the left and right sides with the above beam in between, with its upper end fastened to the above first hardware and its lower end fastened to the first fastening flange of the above energy absorbing member to fix the above energy absorbing member to the above beam; A second metal fitting having a wider width than the other flange of the beam and attached to the side of the other flange of the beam; A second connecting member that forms a pair on the left and right sides with the above column in between, with one end connected to the second fastening flange of the energy absorbing member and the other end connected to the second hardware to fix the energy absorbing member to the column; A weldless seismic reinforcement system characterized by including
In paragraph 1, A weldless seismic reinforcement system characterized in that, in the energy-absorbing member, the rib is formed as a vertical plate-shaped body and has a notch formed on the lower line.
In paragraph 2, A weldless seismic reinforcement system characterized by the above-mentioned notch starting in a circular shape to relieve stress concentration and forming a shape that gradually widens toward the lower line of the rib to provide flexibility to the rib during an earthquake.
In paragraph 1, The first connecting member comprises an upper first fastening part formed as a horizontal plate-shaped body and fastened in a face-to-face contact state corresponding to a portion of the first fastening member that exceeds the width of the upper flange of the beam, a lower first fastening part formed as a horizontal plate-shaped body and fastened in a face-to-face contact state to a portion of the first fastening flange of the energy absorbing member that exceeds the lower flange of the beam, and a plurality of first buckling prevention parts formed as a vertical plate-shaped body and connected to the upper first fastening part and the lower first fastening part to prevent buckling of the beam. A weldless seismic reinforcement system characterized by the above-mentioned second connecting member comprising: a first second fastening part formed as a vertical plate-shaped body and fastened in a state of face contact with a portion of the second fastening flange of the energy absorbing member that exceeds one flange of the column; a second second fastening part formed as a vertical plate-shaped body and fastened in a state of face contact corresponding to a portion of the second fastening member that exceeds the width of another flange of the column; and a plurality of second buckling prevention parts formed as a horizontal plate-shaped body that connect the first second fastening part and the second second fastening part to prevent buckling of the column.
In paragraph 4, The first buckling prevention portion of the first connecting member is formed to extend toward the second web such that one end is in contact with the second web of the beam, and A weldless seismic reinforcement system characterized in that the second buckling prevention portion of the second connecting member is formed to extend toward the first web such that one end is in contact with the first web of the column.
In paragraph 5, The upper first fastening portion of the first connecting member is installed on the same horizontal plane as the upper flange of the beam, and the lower first fastening portion of the first connecting member is installed on the same horizontal plane as the lower flange of the beam. A weldless seismic reinforcement system characterized in that one side of the second connecting member is installed on the same vertical plane as one flange of the column, and the other side of the second connecting member is installed on the same vertical plane as the other flange of the column.
In paragraph 4, A weldless seismic reinforcement system characterized by further installing, between one flange and another flange of the column, an upper horizontal stiffener formed horizontally at the same height as the upper flange of the beam, a lower horizontal stiffener formed horizontally at the same height as the lower flange of the beam, and a vertical stiffener formed vertically by connecting the upper horizontal stiffener and the lower horizontal stiffener.
In Paragraph 7, A first angle that is fastened to the upper first fastening part of the first connecting member in a state where the vertical flange is fastened facing the end plate of the beam, and the horizontal flange is in contact facing the lower surface of the upper first fastening part of the first connecting member and the lower surface of the upper flange of the beam; A second angle that is fastened to the lower second fastening part of the second connecting member in a state where the vertical flange is fastened facing the end plate of the beam and the horizontal flange is in contact facing the upper surface of the lower first fastening part of the first connecting member and the upper surface of the lower flange of the beam; and A weldless seismic reinforcement system further comprising: a third angle in which the upper part of the vertical flange is connected to the one flange of the column and the end plate of the beam while the horizontal flange is in contact with the lower surface of the lower horizontal stiffener, and the lower part of the vertical flange is connected to the second connecting member while the second connecting member is in contact with the second connecting member and the one flange of the column.
In paragraph 4, The first metal fitting comprises a horizontal plate attached to the upper surface of the upper flange of the beam, and a vertical plate extending vertically from one end of the horizontal plate, fastened facing the end plate of the beam, and having a width wider than that of the end plate. A third metal fitting attached to the side of the other flange of the column, having a wider width than the other flange of the column at a height corresponding to the vertical plate of the first metal fitting; and A weldless seismic reinforcement system further comprising: a third connecting member that forms a pair on the left and right sides with the column in between, wherein one end is connected to the vertical plate of the first metal fitting together with the end plate, and the other end is connected to the third metal fitting to fix the vertical plate of the first metal fitting to the column.
In Paragraph 9, A weldless seismic reinforcement system characterized by the above-mentioned third connecting member comprising: a first third fastening part connected in a face-to-face manner corresponding to a portion of the vertical plate of the first metal fitting that exceeds the width of the end plate of the beam; a second third fastening part connected in a face-to-face manner corresponding to a portion of the third metal fitting that exceeds the width of the other flange of the column; and a third buckling prevention part formed as a horizontal plate-shaped body to connect the first third fastening part and the second third fastening part while preventing buckling of the column.
In Paragraph 10, A weldless seismic reinforcement system characterized in that the third buckling prevention portion of the third connecting member is formed to extend toward the first web such that one end is in contact with the first web of the column.
In Paragraph 11, A weldless seismic reinforcement system characterized in that the third fastening portion on the other side of the third connecting member is installed on the same vertical plane as the other flange of the column.
A seismic reinforced building characterized by having a weldless seismic reinforcement system according to any one of claims 1 to 12.
A column installed vertically having a first web and a first flange and a second flange formed respectively on one side and the other side centered on the first web; an end plate attached and fastened facing the first flange of the column, a second web formed elongated in one direction from the end plate, and an upper flange and a lower flange formed respectively on the upper and lower sides centered on the second web; an energy absorbing member comprising a first fastening flange having a width wider than the lower flange of the beam and attached to the lower surface of the lower flange of the beam, a second fastening flange having a width wider than the first flange of the column and attached to the side of the first flange of the column, and a rib connecting the first fastening flange and the second fastening flange that deforms and absorbs energy in the middle during an earthquake; and a first metal fitting having a width wider than the upper flange of the beam and attached to the upper surface of the upper flange of the beam. A first connecting member that forms a pair on the left and right sides of the beam, with its upper end fastened to the first fastening flange of the energy absorbing member and its lower end fastened to the first fastening flange of the energy absorbing member to fix the energy absorbing member to the beam; a second fastening member that has a wider width than the other flange of the beam and is attached to the side of the other flange of the beam; a second connecting member that forms a pair on the left and right sides of the column, with its one end fastened to the second fastening flange of the energy absorbing member and its other end fastened to the second fastening member to fix the energy absorbing member to the column; and a third fastening member that has a wider width than the other flange of the column and is attached to the side of the other flange of the column at a height corresponding to the vertical plate of the first fastening member. A third connecting member that forms a pair on the left and right sides with the column in between, with one end connected to the vertical plate of the first metal fitting together with the end plate, and the other end connected to the third metal fitting to fix the vertical plate of the first metal fitting to the column; a first angle that is connected to the upper first connecting part of the first connecting member in a state where the vertical flange is connected facing the end plate of the beam, and the horizontal flange is in contact facing the lower surface of the upper first connecting part of the first connecting member and the lower surface of the upper flange of the beam; and a second angle that is connected to the lower second connecting part of the second connecting member in a state where the vertical flange is connected facing the end plate of the beam, and the horizontal flange is in contact facing the upper surface of the lower first connecting part of the first connecting member and the upper surface of the lower flange of the beam. A construction method for a weldless seismic reinforcement system comprising: a third angle in which the upper part of the vertical flange is connected to the one flange of the column and the end plate of the beam while the horizontal flange is in contact with the lower surface of the lower horizontal stiffener, and the lower part of the vertical flange is connected to the second connecting member's second connecting part while the second connecting part of the second connecting member is in contact with the one flange of the column. A first step of attaching the first metal fitting to the upper surface of the upper flange of the beam and then fastening it to the end plate; A second step of fastening a pair of first angles and a pair of second angles to the horizontal plate of the end plate; A third step of simultaneously fastening the upper first fastening portion of the first connecting member to the first hardware and the first angle; A fourth step of simultaneously fastening a third fastening portion on one side of the third connecting member to the first hardware and the end plate; Step 5: Attaching the above third metal fitting to the other flange of the column and then connecting it to the third fastening part on the other side of the above third connecting member; Step 6, simultaneously fastening the first fastening flange of the energy absorption member to the lower first fastening part of the first connecting member and the second angle; Step 7: Attaching the above third angle to one flange of the column and the lower horizontal stiffener; Step 8, simultaneously fastening a second fastening portion on one side of the second connecting member to the third angle and the second fastening flange of the energy absorbing member; Step 9, attaching the above-mentioned second metal fitting to another flange of the column and then fastening it to the second fastening part on one side of the second connecting member; A construction method for a weldless seismic reinforcement system characterized by including

Description

Non-welded seismic reinforcement system with energy-absorbing ribs for seismic retrofitting of steel structure connections The present invention relates to a seismic reinforcement system for steel structure joints, and more specifically, to a weldless seismic reinforcement system equipped with an energy-absorbing rib that applies a notched rib designed to absorb most of the seismic energy to prevent damage to key members and improve seismic performance of existing end-plate type beam-column joints, while completely eliminating welding work during construction to eliminate quality degradation and the risk of fire caused by welding by unskilled workers. Generally, a steel structural joint of columns and beams refers to a structure in a building that includes columns, beams, and connecting members that connect the columns and beams. With the recent increase in demand for super high-rise buildings, interest in seismic design has grown significantly to prevent building collapse and minimize damage caused by high-intensity earthquakes. Consequently, there is also a growing interest in and need for steel structural joints with stable seismic performance to prepare for earthquakes. Up until now, as shown in Fig. 1, seismic reinforcement such as haunch reinforcement and horizontal stiffeners has been used to increase the strength near the joint to prevent brittle fracture of the steel structure joint. However, while haunch welding reinforcement of the joint has excellent performance in terms of reducing brittle fracture and improving seismic performance, it was accompanied by early local buckling due to plastic deformation of the main members. Meanwhile, as shown in Figure 2, when reinforcing with horizontal stiffeners, the strength increases, but problems such as brittle fracture and local flange buckling occur due to the rapid change in cross-section at the beam end. Furthermore, in order to apply the above seismic reinforcement methods to existing buildings, welding work must be performed on-site along with bolt fastening; however, considering the actual site conditions, realistic constraints on the work were inevitable. Specifically, as the quality difference based on the skill level of the welder increased, the probability of defects occurring increased for non-skilled welders, affecting structural safety. Additionally, critical problems arose, such as the increased risk of fire at construction sites where numerous flammable and combustible materials are present, as well as the possibility of damage to buried wiring and cramped workspaces due to the increased number of bolt hole drilling operations on-site. FIGS. 1 and 2 are reference diagrams for explaining a column-beam seismic reinforcement system according to the prior art. FIG. 3 is a front view of a weldless seismic reinforcement system according to an embodiment of the present invention. FIG. 4 is a perspective view illustrating a weldless seismic reinforcement system according to an embodiment of the present invention. FIG. 5 is an exploded perspective view illustrating a weldless seismic reinforcement system according to an embodiment of the present invention. FIG. 6 is a front view of a weldless seismic reinforcement system according to an embodiment of the present invention. FIG. 7 is a plan view of a weldless seismic reinforcement system according to an embodiment of the present invention. FIG. 8 is a bottom view of a weldless seismic reinforcement system according to an embodiment of the present invention. FIG. 9 is a side view of a weldless seismic reinforcement system according to an embodiment of the present invention. FIG. 10 is a reference diagram for explaining a construction method of a weldless seismic reinforcement system according to an embodiment of the present invention. A weldless seismic reinforcement system according to embodiments of the present invention will be described in detail with reference to the attached drawings. Since the present invention is susceptible to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. Similar reference numerals have been used for similar components in the description of each drawing. In the attached drawings, the dimensions of the structures are depicted enlarged or reduced to the actual size to ensure clarity of the present invention or to allow for understanding of the schematic configuration. Additionally, terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departin